If players could opt for an automatic standing hand on hard 12 against a 4, the optimal strategy would change in the following ways:
1. New basic strategy: The basic strategy would need to be adjusted to account for the new rule. For example, players may choose to stand on hard 12 against a 4 instead of hitting.
2. New deviations: Advantage players may choose to deviate from the new basic strategy in certain situations. For example, players may choose to hit on a hard 12 against a 4 if the dealer is showing a weak hand.
1. New basic strategy: The basic strategy would need to be adjusted to account for the new rule. For example, players may choose to stand on hard 12 against a 4 instead of hitting.
2. New deviations: Advantage players may choose to deviate from the new basic strategy in certain situations. For example, players may choose to hit on a hard 12 against a 4 if the dealer is showing a weak hand.